Method for producing brochantite patina on copper

Details Method for producing brochantite patina on copper Method for producing brochantite patina on copper

C - Chemistry, Metallurgy

25

D

C25D 11/34 (2006.01)

Patent

CA 2190419

A passthrough method is provided in which the surface of an industrial grade, low-grease precursor made of copper, with a defined surface roughness, is patinated. For this purpose the precursor material, connected as the anode, is passed through an electrolysis bath, containing sodium carbonate and/or sodium hydrogencarbonate as well as sodium sulfite and/or sodium disulfite, with a temperature of 30°C to 90°C and a current density of 1 A/dm2 to 20 A/dm2 as bath parameters, for a residence time of 10 seconds to 12 minutes. The precursor material is rinsed and then moved through a fixing bath at a temperature of 35°C to 95°C for a residence time of 10 seconds to 120 seconds, and lastly, after a further rinsing, is dried. The fixing bath contains at least one of the oxidation agents: hydrogen peroxide (H2O2), potassium chlorate (KCIO3), potassium peroxodisulfate (K2S2O8), potassium permanganate (KMnO4), or copper sulfate (CuSo45H2O).

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